Rate normalization of buildup pressure using afterflow data

Conference · Sat Oct 01 04:00:00 EDT 1983 · Soc. Pet. Eng. AIME, Pap.; (United States)

OSTI ID:5360546

Fetkovich, M J; Vienot, M E

Field data indicates that in some instances significant afterflow occurs after a well is considered shut-in. An analysis method for afterflow dominated pressure buildup data is presented whereby the correct analytical model describing the transient behavior of the well can be directly obtained by matching a log-log plot of the rate normalized pressure vs time data to published type curves. The P-t model thus obtained allows a rigorous mathematical superposition analysis to be performed on the same data with results equivalent to those obtained from the normalized type-curve analysis. This work demonstrates that rate normalization must be based on total afterflow rates, confirming with field data Perrine's assumption that total rate should be used in multiphase flow analyses. Dramatic changes in character are seen between the rate normalized pressure vs time and the conventional pressure vs time log-log data plots for low permeability stimulated wells. Several field examples demonstrate the application of this simple and effective technique.

• Research Organization: Philips Petroleum Co.
• OSTI ID: 5360546
• Report Number(s): CONF-8310121-
• Conference Information: Journal Name: Soc. Pet. Eng. AIME, Pap.; (United States) Journal Volume: SPE12179
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
BUILDUP
COMPRESSIBILITY
DATA
DATA ANALYSIS
DIAGRAMS
FLOW MODELS
FLOW RATE
FLUID FLOW
FLUIDS
INFORMATION
MATHEMATICAL MODELS
MECHANICAL PROPERTIES
NATURAL GAS WELLS
NUMERICAL DATA
OIL WELLS
PRESSURE DEPENDENCE
RESERVOIR FLUIDS
RESERVOIR PRESSURE
RESERVOIR ROCK
TIME DEPENDENCE
TRANSIENTS
WELL COMPLETION
WELLS